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Muscular System Objective 1.04
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1.04 Remember the structures of the muscular system
Comprises nearly half our weight. Over 650 muscles. Each muscle is made up of hundreds or thousands of muscle fibers. 1.04 Remember the structures of the muscular system
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The Muscular System: Muscle Fibers
Bundles of threadlike structures called myofibrils Composed of: Myosin Actin Form overlapping pattern called sarcomere muscle muscle fiber sarcolemma sarcomere functional unit of muscle movement 1.04 Remember the structures of the muscular system
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Structures of the muscular system
Muscles Skeletal Smooth Cardiac Sphincter Connective tissue Tendons Fascia 1.04 Remember the structures of the muscular system
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Structures of the muscular system
Types of Muscle Skeletal muscles Attached to bone Striated (striped) appearance Voluntary Multinucleated muscle cell bundles 1.04 Remember the structures of the muscular system
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Structures of the muscular system
Types of Muscle Smooth muscles Also known as visceral muscles Involuntary Located in walls of digestive system, uterus & blood vessels 1.04 Remember the structures of the muscular system
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Structures of the muscular system
Types of Muscle Cardiac muscle Found only in the heart Striated, branched Involuntary Cells are fused- when one contracts, they all contract, creating the heartbeat 1.04 Remember the structures of the muscular system
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Structures of the muscular system
Types of Muscle Sphincter muscles Also called dilator muscles Special, circular muscles Located in the digestive system urinary system 1.04 Remember the structures of the muscular system
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Structures of the muscular system
Types of Muscle Skeletal Smooth Cardiac Sphincter 1.04 Remember the structures of the muscular system
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Structures of the muscular system
Connective tissue Tendons dense bands that connect skeletal muscle to the bone 1.04 Remember the structures of the muscular system
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Structures of the muscular system
Connective tissue Fascia Fibrous connective tissue sheets that wrap around muscle bundles 1.04 Remember the structures of the muscular system
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How do skeletal muscles get their names?
Location Location of origin and insertion Size Action flexor Direction Extensor Number of origins Depressor However, not all muscles are named by the above methods! 1.04 Remember the structures of the muscular system
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1.04 Remember the structures of the muscular system
Head & Neck Muscles 1.04 Remember the structures of the muscular system
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Torso/Trunk (anterior)
1.04 Remember the structures of the muscular system
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Torso/Trunk (anterior)
1.04 Remember the structures of the muscular system
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Torso/Trunk (posterior)
1.04 Remember the structures of the muscular system
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1.04 Remember the structures of the muscular system
Upper extremities 1.04 Remember the structures of the muscular system
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1.04 Remember the structures of the muscular system
Lower extremities 1.04 Remember the structures of the muscular system
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The muscular system review Anterior view
1.04 Remember the structures of the muscular system
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The muscular system review Posterior view
1.04 Remember the structures of the muscular system
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Characteristics of Muscles
Contractibility Excitability Extensibility Elasticity 1.05 Understand the functions and disorders of the muscular system
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Characteristics of Muscles
Contractibility 1.05 Understand the functions and disorders of the muscular system
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Characteristics of Muscles
Contractibility Myoneural stimulation + contraction of muscle proteins = movement and heat 1.05 Understand the functions and disorders of the muscular system
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Characteristics of Muscles
Excitability 1.05 Understand the functions and disorders of the muscular system
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Characteristics of Muscles
Extensibility 1.05 Understand the functions and disorders of the muscular system
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Characteristics of Muscles
Elasticity 1.05 Understand the functions and disorders of the muscular system
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Characteristics of Muscles
Contractibility Excitability Extensibility Elasticity 1.05 Understand the functions and disorders of the muscular system
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Characteristics of Muscles
Contractibility 1.05 Understand the functions and disorders of the muscular system
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Characteristics of Muscles
Contractibility Myoneural stimulation + contraction of muscle proteins = movement and heat (side effect) 1.05 Understand the functions and disorders of the muscular system
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Characteristics of Muscles
Contractibility Neurotransmitter at site of muscle stimulus. The sodium-potassium pump of the membrane of a muscle cell. The purpose of this slide is to illustrate the complexity of the process of movement. 1.05 Understand the functions and disorders of the muscular system
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Muscle Tone Discuss muscle tone. Atrophy:
a- ________ -trophy _nourishment / development___ Hypertrophy: hyper- _______ -trophy _nourishment / development__ 1.05 Understand the functions and disorders of the muscular system
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1.05 Understand the functions and disorders of the muscular system
Muscle Tone John just got a cast off his leg. His calf muscle on the affected leg is 1” smaller in diameter than his other calf muscle. What happened? How do you explain this to him? 1.05 Understand the functions and disorders of the muscular system
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1.05 Understand the functions and disorders of the muscular system
Muscle Fatigue Discuss muscle fatigue: What causes muscle fatigue? How does the body correct muscle fatigue? Is muscle fatigue dangerous? Why / why not? Discuss aerobic and anaerobic exercise. Give examples of each. 1.05 Understand the functions and disorders of the muscular system
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Functions of the Muscular System
What are the functions of the muscular system? 1.05 Understand the functions and disorders of the muscular system
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Movement: Skeletal Muscle
Receptors in muscles provide the brain with information about body position and movement. The brain controls the contraction of skeletal muscle. 1.05 Understand the functions and disorders of the muscular system
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Movement As your muscle contracts, one of the bones will move with the other will remain stationary. Point of origin (end of the muscle that is attached to the stationary bone) Point of insertion (end of muscle that is attached to the moving bone) Prime mover or agonist Antagonist – muscles that cause movement in the opposite direction Synergists – assist primary mover All movement is a result of contraction of primary movers and relaxation of opposing muscles.
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Movement: Digestive System
The nervous system regulates the speed at which food moves through the digestive tract. 1.05 Understand the functions and disorders of the muscular system
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Movement: Circulatory System Heartbeat
The nervous system and hormones regulate the speed at which the heart beats. 1.05 Understand the functions and disorders of the muscular system
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1.05 Understand the functions and disorders of the muscular system
Posture How does the muscular system effect posture? 1.05 Understand the functions and disorders of the muscular system
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1.05 Understand the functions and disorders of the muscular system
Body Heat What is the body’s response to cold? Why? How is this response helpful? How does the body respond to exercise? Why? 1.05 Understand the functions and disorders of the muscular system
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1.05 Understand the functions and disorders of the muscular system
Fibromyalgia Discuss the pictures and how they relate to fibromyalgia. Cause - unknown Symptoms – chronic pain, fatigue, depression Diagnosis – location of pain Treatment – symptom mgt Prognosis – good…management 1.05 Understand the functions and disorders of the muscular system
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Hernia Weakness in the muscles of the abdominal wall that allows loops of intestine to balloon outward Causes – muscle weakness, excessive internal pressure Locations – groin, abd Symptoms – protrusion, pain Diagnosis – palpation, mri Treatment - surgery Prevention – abd exercises
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Muscle Spasms (Involuntary hypertonicity)
Symptoms – severe pain Diagnosis – hx, physical exam Treatment – rest, stretching, exercise Prognosis - good 1.05 Understand the functions and disorders of the muscular system
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Muscular Dystrophy Cause – genetic defect…progressive weakness and degeneration of skeletal muscle Symptoms – muscle weakness, drooling, falling, eyelid drooping (ptosis) Diagnosis – physical exam, genetic test Treatment – no treatment to stop or reverse MD…treat symptoms Prognosis - variable
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1.05 Understand the functions and disorders of the muscular system
Myasthenia Gravis Cause - Autoimmune attack at neuromuscular junction…affects voluntary muscles…problem with how nerves stimulate muscles to contract Symptoms – progressive, fluctuating muscle weakness and fatigue Diagnosis – blood tests, EMG Treatment – steroids, immunosuppressant drugs Prognosis – with treatment may lead a normal, active life…remission possible 1.05 Understand the functions and disorders of the muscular system
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1.05 Understand the functions and disorders of the muscular system
Strain Overstretching of the tendons or the muscles themselves (“pulled muscle”). Treatment = RICE 1.05 Understand the functions and disorders of the muscular system
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1.05 Understand the functions and disorders of the muscular system
Tendonitis Usually from chronic injury, overuse Pain and inflammation are common Treatment = (P)RICE 1.05 Understand the functions and disorders of the muscular system
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Tetanus (Lockjaw) Caused from a bacterial infection of clostridium tetani usually after puncture wound. Symptoms include progressive muscle spasms, paralysis, stiffness and pain especially in jaw. Diagnosis - physical exam, lab tests, history of wound Treatment – wound hygiene, tetanus vaccine, pain management Prognosis – without treatment 1 in 4 die…with treatment less than 10% infected die
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